Hard Wired is a suitable choice for players that use excessive EMP Grenades, in a similar fashion to using Tactical Mask with Flashbangs and Concussion Grenades—though Tactical Mask does not make the player completely immune to Flashbangs and Concussion Grenades, unlike Hard Wired which makes the player completely immune to EMP grenades—to prevent players from stunning themselves. The EMP effect to the player is completely absent: the player's HUD and electronics remain unaffected, while still destroying nearby enemy equipment and disabling enemies' HUDs effectively—unless they, too, have the perk.

It is worth noting that Hard Wired allows the player to call in scorestreaks when an enemy's EMP is active; however, Hard Wired will not protect the player's equipment or scorestreak rewards from the EMP detonation, nor from incoming EMP grenades.

Hard Wired returns once again in Call of Duty: Advanced Warfare. This perk prevents the player's HUD from going fuzzy and allows the player to maintain their Exo abilities after an enemy System Hack. Any equipment/Scorestreaks that were active before an enemy System Hack was called in will still be destroyed if the system hack had the Disable Equipment/Disable Streaks module equipped respectively.

If an enemy UAV scrambler is up in the air, the player will be immune to the scrambling effects and the player's minimap will not be scrambled. However, the player will still appear on the enemies' minimap if the player does not have Low Profile.

This is best used in most flag capture games such as Domination and Momentum, as Scorestreaks are easy to get and most people will drop System Hacks and to be immune to them will help the player a lot. Stun and EMP grenade resistance will also help the player while capturing points. This perk overall should be only used if the player gets System Hacked often or if the player wants to be immune to the EMP and Stun Grenades.

As the only source of Nano Swarms so far is a module of the Missile Strike, many do not have to worry about it. However, if there is a Nano Swarm (a bubble of red or blue depending on team), players can walk straight through without taking damage if they have this perk.

An update was added that now prevents users to flinch when hit by tactical grenades, such as EMP or Stun grenades.